User menu

Accès à distance ? S'identifier sur le proxy UCLouvain

P-wave attenuation in creeping rock and system identification

Primary tabs

Moustachi, O Thimus, Jean-François [UCL]

The aim of this paper is to contribute to the evaluation of rock cracking using ultrasonic wave propagation. The rock specimens (siltstone sampled from a coal mine at a depth of 820 meters in Belgium) are subjected to incremental creep. The study of the rock transfer function shows P-wave attenuation in the direction of loading as a function of stress and time during the test: this attenuation becomes more significant at the stage at which the rock dilates. It is obvious from the specimen dimensions that the signal is affected by reflection phenomena. So, we have modelled the output signals with a model containing reflections. The simulations obtained from the model and input signal are very conclusive and the model validation is satisfying.

Document type Article de périodique (Journal article) – Article de recherche
Access type Accès restreint
Publication date 1997
Language Anglais
Journal information "Rock Mechanics and Rock Engineering" - Vol. 30, no. 4, p. 169-180 (1997)
Peer reviewed yes
Publisher Springer-verlag Wien (Vienna)
issn 0723-2632
e-issn 1434-453X
Publication status Publié
Affiliation UCL
Links
  1. Bourbié, T., Coussy, O., Zinsner, B. (1986): Acoustique des milieux poreux. Publications de I'Institut Français du Pétrole. Sciences et Technique du Pétrole 27. Technip, Paris.
  2. Couvreur, J. Fr., Thimus, J. Fr. (1996): The properties of coupling agents in improving ultrasonic transmission. Int. J. Rock. Mech. Min. Sci. Geomech. Abstr. 33(4), 417?424.
  3. Cristescu, N. (1989): Rock rheology. Mechanics of elastic and inelastic solids, Kluwer, Dordrecht.
  4. Franklin, J. A., Dusseault, M. B. (1989): Rock engineering, McGraw-Hill, New-York.
  5. Gladwin, M. T., Stacey, F. D. (1974): Ultrasonic pulse velocity as a rock stress sensor. Tectonophysics 21, 39?45.
  6. Klimis, N. (1988): Etude en laboratoire de l'atténuation des ondes longitudinales: application à la caractérisation géotechnique des roches. Rapport des Laboratoires des Ponts et Chaussées GT 28.
  7. Li, C., Nordlund, E. (1993): Effects of couplants on acoustic emission. Rock Mech. Rock Engng. 26(1), 63?69.
  8. Ljung, L. (1987): System identification, theory for the user, Prentice-Hall, New York.
  9. Locat, J., Beausejour, N., Berube, M. A. (1986): Utilisation du céléromètre ultrasonique sur des sols cohérents. Can. Geoch. J. 23, 247?250.
  10. Oppenheim, A. V. Schafer, R. W. (1975): Digital signal processing, Prentice-Hall, New York.
  11. Pain, H. J. (1976): The physics of vibrations and waves, John Wiley, New York.
  12. Tao, G., King, M. S. (1990): Shear-wave velocity and Q anisotropy in rocks: A laboratory study. Int. J. Rock Mech. Min. Geomech Abstr. 27 (5), 353?361.
  13. Tarif, P., Bourbié, T. (1987): Experimental comparison between spectral ratio and rise techniques for attenuation measurement. Geophysical Prospecting 35, 668?680.
  14. Toksöz, M. N., Johnson, D. H., Timur, A. (1979): Attenuation of seismic waves in dry and saturated rocks 1. Laboratory measurements. Geophysics 44, 681?690.
Bibliographic reference Moustachi, O ; Thimus, Jean-François. P-wave attenuation in creeping rock and system identification. In: Rock Mechanics and Rock Engineering, Vol. 30, no. 4, p. 169-180 (1997)
Permanent URL http://hdl.handle.net/2078.1/45864